Reaction kinetics of CaO with HCl in a biomass boiler

Biomass direct-combustion power generation is an important way to utilize bioenergy,but the boilers can be damaged by the high HCl concentrations from the biomass combustion.The kinetics of the intrinsic reaction between CaO and HC1 were investigated using a thermogravimetric analyzer.The experimental results indicate that the chemical reaction rate increases with temperature for 600-800℃,the reaction follows the Arrhenius law,the apparent activation energy,Er,of the intrinsic reaction is 35.90 kJ·mol-1 and the preexponential constant,Z,is 5.246×10-3 m·s-1.When the temperature exceeds 850℃,the intrinsic reaction rate constant decreases rapidly with increasing temperature,Er and Z are functions of the temperature,and the apparent activation energy is negative.The intrinsic reaction is first order in the HCl concentration for the experimental conditions.